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          iOS获取系统时区
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        <h2 id="需求"><a href="#需求" class="headerlink" title="需求"></a>需求</h2><p>APP 需要获取当前手机的时区，并以<code>GMT+8</code>的格式传给服务器。</p>
<h2 id="解决方案"><a href="#解决方案" class="headerlink" title="解决方案"></a>解决方案</h2><p>经过搜索以及测试，发现三种方法可以获取到手机的当前时区，不过在后面发现其中一种方法是有问题的。下面就来解析下三种方法。</p>
<h3 id="方法一（后来发现这种方法有问题）"><a href="#方法一（后来发现这种方法有问题）" class="headerlink" title="方法一（后来发现这种方法有问题）"></a>方法一（后来发现这种方法有问题）</h3><figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">[<span class="built_in">NSTimeZone</span> resetSystemTimeZone];</span><br><span class="line"><span class="built_in">NSTimeZone</span> *timeZone = [<span class="built_in">NSTimeZone</span> systemTimeZone];</span><br><span class="line"><span class="built_in">NSLog</span>(<span class="string">@&quot;timeZoneString = %@&quot;</span>,timeZone.abbreviation);</span><br></pre></td></tr></table></figure>
<p>在本地测试没有问题，比如手机时间是东八区的时间，那么就打印出<code>GMT+8</code>，设置成其他地区的时间也正常。<br>但当时区设置为<code>0</code>时，打印出来的是<code>GMT</code>，而不是<code>GMT+0</code>，从这个角度看，这种方法似乎也不妥，还需要自己转换。  </p>
<p>此外，经过大量的测试，这种方法在个别手机上获取到的时间格式不是<code>GMT</code>的格式。比如香港的个别手机获取到的时区是<code>HKT</code>，表示的是香港时间。同样每个地区都有当地时区的简称（参考：<a target="_blank" rel="noopener" href="http://www.shijian.cc/shiqu/">世界时区</a>）。  <strong>那么说明这种方法已经不适合了。。。。</strong></p>
<p>其实看看文档就会发现这种方法不适合目前的需求。</p>
<blockquote>
<p>The abbreviation for the receiver, such as “EDT” (Eastern Daylight Time).  </p>
</blockquote>
<span id="more"></span>

<h3 id="方法二"><a href="#方法二" class="headerlink" title="方法二"></a>方法二</h3><figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">NSDate</span> *date = [<span class="built_in">NSDate</span> date];</span><br><span class="line"><span class="built_in">NSDateFormatter</span> *dateFormatter = [[<span class="built_in">NSDateFormatter</span> alloc] init];</span><br><span class="line">dateFormatter.dateFormat = <span class="string">@&quot;z&quot;</span>;</span><br><span class="line"><span class="built_in">NSLog</span>(<span class="string">@&quot;timeZoneString = %@&quot;</span>,[dateFormatter stringFromDate:date]);</span><br></pre></td></tr></table></figure>
<p>这种方法没有做大量的测试。当时区设置为<code>0</code>时，同样打印出来的是 <code>GMT</code>。<strong>这让我觉得这种方法也有可能会出现方法一的问题。</strong></p>
<blockquote>
<p>这里小写的<code>z</code>表示的是<code>时区</code>的意思。同样也可是试试看看大写的<code>Z</code>。</p>
</blockquote>
<h3 id="方法三"><a href="#方法三" class="headerlink" title="方法三"></a>方法三</h3><figure class="highlight objc"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line">[<span class="built_in">NSTimeZone</span> resetSystemTimeZone];</span><br><span class="line"><span class="built_in">NSInteger</span> offset = [<span class="built_in">NSTimeZone</span> systemTimeZone].secondsFromGMT;</span><br><span class="line">offset = offset / <span class="number">3600</span>;</span><br><span class="line"><span class="built_in">NSString</span> *timeZoneString = <span class="literal">nil</span>;</span><br><span class="line"><span class="keyword">if</span> (offset &lt; <span class="number">0</span>) &#123;</span><br><span class="line">	timeZoneString = [<span class="built_in">NSString</span> stringWithFormat:<span class="string">@&quot;GMT%ld&quot;</span>, offset];</span><br><span class="line">&#125; <span class="keyword">else</span> &#123;</span><br><span class="line">	timeZoneString = [<span class="built_in">NSString</span> stringWithFormat:<span class="string">@&quot;GMT+%ld&quot;</span>, offset];</span><br><span class="line">&#125;</span><br><span class="line"><span class="built_in">NSLog</span>(<span class="string">@&quot;timeZoneString = %@&quot;</span>,timeZoneString);</span><br></pre></td></tr></table></figure>
<p>通过时间偏差来计算时区，这也是目前项目中使用的方法。</p>
<h2 id="相关方法解析"><a href="#相关方法解析" class="headerlink" title="相关方法解析"></a>相关方法解析</h2><p><code>- (NSInteger)secondsFromGMT;</code><br>获取到当前时区和0时区的间隔秒数。</p>
<p><code>+ (NSTimeZone *)systemTimeZone;</code><br><code>+ (NSTimeZone *)localTimeZone;</code><br><code>+ (NSTimeZone *)defaultTimeZone;</code><br>区别<br>1、systemTimeZone 获取系统的时区，不可设置。<br>2、localTimeZone 没懂！！！<br>3、defaultTimeZone 获取当前APP的时区，可以自己设置。  </p>
<p>关于这三个方法的区别，可以参考这篇文章 <a target="_blank" rel="noopener" href="https://stackoverflow.com/questions/5985468/iphone-differences-among-time-zone-convenience-methods">iPhone - Differences among time zone convenience methods</a></p>
<h3 id="注意"><a href="#注意" class="headerlink" title="注意"></a>注意</h3><p>调用 <code>systemTimeZone</code> 方法之前最好先调用 <code>resetSystemTimeZone</code> 方法清掉缓存。</p>

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